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Malignant disease affects 10 per 100,000 children per year.
The breakdown is:
Note that acute lymphoblastic leukaemia is the commonest form of leukaemia in children. Less than 5% of childhood tumours are acute or chronic myeloid leukaemia.
Generally childhood tumours tend to be poorly differentiated, fast growing, very malignant, very vascular and to show early and widespread early metastasis.